#054: Castle Wall

After the last few puzzles I figured I should force myself to just make a normal puzzle in a normal genre. Enjoy!

That said, I also set out to make an easy puzzle, but then I spotted some interesting logic and couldn’t resist. So here’s a medium-difficulty puzzle instead, I guess.

Rules: Draw a non-intersecting loop through the centres of some cells. The loop may not enter outlined cells or cells containing clues. White cells with outlines must lie inside the loop, while black cells with outlines must lie outside the loop. Grey cells may either be inside or outside the loop. A number represents the sum of the lengths of loop segments in the indicated direction.